All errors › ORA errors
ORA-00904: Invalid identifier
What it means
A column, alias or function name in the statement does not exist or is not visible at that point: typo, column missing in that table, a column alias used in WHERE/GROUP BY of the same query level, or a name created in quotes with different case ("MyCol" vs MYCOL).
How to fix it
Check the spelling against ALL_TAB_COLUMNS. Column aliases from the SELECT list can only be used in ORDER BY (wrap the query in an inline view to filter on them). If the object was created with quoted mixed-case names you must quote them every time.
Catch it before it runs
ORA Error Helper
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Nearby errors
Updated 2026-11-12.